HP 35s HP 35s scientific calculator - User Guide - Page 58
Chain Calculations in RPN Mode, Work from the Parentheses Out
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Keys: Display Description: Light-years to Rigel Centaurus. Speed of light, c. Meters to R. Centaurus. Retrieves c. Meters to Sirius. Chain Calculations in RPN Mode In RPN mode, the automatic lifting and dropping of the stack's contents let you retain intermediate results without storing or reentering them, and without using parentheses. Work from the Parentheses Out For example, evaluate (12 + 3) × 7. If you were working out this problem on paper, you would first calculate the intermediate result of (12 + 3) ... (12 + 3) = 15 ... then you would multiply the intermediate result by 7: (15) × 7 = 105 Evaluate the expression in the same way on the HP 35s, starting inside the parentheses. Keys: Display: Description: Calculates the intermediate result first. You don't need to press to save this intermediate result before proceeding; since it is a calculated result, it is saved automatically. 2-12 RPN: The Automatic Memory Stack